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git-svn: convert SVN 1.5+ / svnmerge.py svn:mergeinfo props to parents

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This feature is long overdue; convert SVN's merge representation to git's
as revisions are imported.  This works by converting the list of revisions
in each line of the svn:mergeinfo into git revision ranges, and then
checking the latest of each of these revision ranges for A) being new and
B) now being completely merged.

Signed-off-by: Sam Vilain <sam.vilain@catalyst.net.nz>
Acked-by: Eric Wong <normalperson@yhbt.net>
This commit is contained in:
Sam Vilain 2009-10-20 15:42:03 +13:00 committed by Eric Wong
parent ce62683096
commit dff589ef94
2 changed files with 114 additions and 0 deletions
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93
git-svn.perl
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@ -2918,6 +2918,93 @@ sub find_extra_svk_parents {
}
}
# note: this function should only be called if the various dirprops
# have actually changed
sub find_extra_svn_parents {
my ($self, $ed, $mergeinfo, $parents) = @_;
# aha! svk:merge property changed...
# We first search for merged tips which are not in our
# history. Then, we figure out which git revisions are in
# that tip, but not this revision. If all of those revisions
# are now marked as merge, we can add the tip as a parent.
my @merges = split "\n", $mergeinfo;
my @merge_tips;
my @merged_commit_ranges;
my $url = $self->rewrite_root || $self->{url};
for my $merge ( @merges ) {
my ($source, $revs) = split ":", $merge;
my $path = $source;
$path =~ s{^/}{};
my $gs = Git::SVN->find_by_url($url.$source, $url, $path);
if ( !$gs ) {
warn "Couldn't find revmap for $url$source\n";
next;
}
my @ranges = split ",", $revs;
my ($tip, $tip_commit);
# find the tip
for my $range ( @ranges ) {
my ($bottom, $top) = split "-", $range;
$top ||= $bottom;
my $bottom_commit =
$gs->rev_map_get($bottom, $self->ra_uuid) ||
$gs->rev_map_get($bottom+1, $self->ra_uuid);
my $top_commit =
$gs->rev_map_get($top, $self->ra_uuid);
unless ($top_commit and $bottom_commit) {
warn "W:unknown path/rev in svn:mergeinfo "
."dirprop: $source:$range\n";
next;
}
push @merged_commit_ranges,
"$bottom_commit..$top_commit";
if ( !defined $tip or $top > $tip ) {
$tip = $top;
$tip_commit = $top_commit;
}
}
unless (!$tip_commit or
grep { $_ eq $tip_commit } @$parents ) {
push @merge_tips, $tip_commit;
} else {
push @merge_tips, undef;
}
}
for my $merge_tip ( @merge_tips ) {
my $spec = shift @merges;
next unless $merge_tip;
my @cmd = ('rev-list', "-1", $merge_tip,
"--not", @$parents );
my ($msg_fh, $ctx) = command_output_pipe(@cmd);
my $new;
while ( <$msg_fh> ) {
$new=1;last;
}
command_close_pipe($msg_fh, $ctx);
if ( $new ) {
push @cmd, @merged_commit_ranges;
my ($msg_fh, $ctx) = command_output_pipe(@cmd);
my $unmerged;
while ( <$msg_fh> ) {
$unmerged=1;last;
}
command_close_pipe($msg_fh, $ctx);
if ( $unmerged ) {
warn "W:svn cherry-pick ignored ($spec)\n";
} else {
warn
"Found merge parent (svn:mergeinfo prop): ",
$merge_tip, "\n";
push @$parents, $merge_tip;
}
}
}
}
sub make_log_entry {
my ($self, $rev, $parents, $ed) = @_;
my $untracked = $self->get_untracked($ed);
@ -2930,6 +3017,12 @@ sub make_log_entry {
$self->find_extra_svk_parents
($ed, $props->{"svk:merge"}, \@parents);
}
if ( $props->{"svn:mergeinfo"} ) {
$self->find_extra_svn_parents
($ed,
$props->{"svn:mergeinfo"},
\@parents);
}
}
open my $un, '>>', "$self->{dir}/unhandled.log" or croak $!;

21
t/t9151-svn-mergeinfo.sh Normal file
View File

@ -0,0 +1,21 @@
#!/bin/sh
#
# Copyright (c) 2007, 2009 Sam Vilain
#
test_description='git-svn svn mergeinfo properties'
. ./lib-git-svn.sh
test_expect_success 'load svn dump' "
svnadmin load -q '$rawsvnrepo' < '../t9151/svn-mergeinfo.dump' &&
git svn init --minimize-url -R svnmerge \
-T trunk -b branches '$svnrepo' &&
git svn fetch --all
"
test_expect_success 'svn merges were represented coming in' "
[ `git cat-file commit HEAD | grep parent | wc -l` -eq 2 ]
"
test_done